While I do believe this as well, I don't think there is any way to prove this with current knowledge. You can introspect and separate your experience of a color from your language, but this type of introspection can also be misleading. And that's about all you can do - we don't know of any way to objectively test if another organism experiences qualia, and any historical/evolutionary evidence is also lost.
I thought the point above was in a similar vein - that qualia and language are theoretically separable phenomena, so that we can imagine a being might have qualia without language, or language without qualia, and so these need to be explained separately. I was trying to point out that we have no proof for the existence of beings that possess these two qualities separately, so that I don't think the theoretical distinction is necessarily true. Just like any volume of gas has a temperature and a pressure, the existence of separate concepts doesn't mean they are physically separable.
Qualia represents the compressed past experiences acting as a screen on which we represent new experiences, language is compressed past experiences from others and from past generations. Both work to reduce costs of cognition and action. (imho)